JPH11156548A - Torch for arc - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the attachment/detachment of a non-consumable electrode from the opposite direction to a torch tip side under the condition that the position of a torch body is fixed, as well as to freely set the protruded length of the electrode being attached by installing a fixing tool to fix a collet body mounting member formed spirally movable in the shaft direction of the torch body, at a desired position. SOLUTION: When the tip of a non-consumable electrode 9 is deformed and consumed, a collet body mounting member 3 is operated to move in a X2 direction, and then the mounting member 3 and the non-consumable electrode 9 are integrally pulled out from a torch body 1 towards the X2 direction. Further, when it is necessary to change the protruded length of the electrode 9 from a gas nozzle 2 from L2 to L3 during the welding operation, the member 3 is spirally moved by L3 -L2 in a X1 direction against the torch body 1 after a fixing tool 8 is loosed. Thereafter, the member 3 is again fixed to the torch body 1 by the tool 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric arc torch in which a non-consumable electrode is disposed at the tip of a torch body.

[0002]

2. Description of the Related Art Generally, tungsten or a tungsten alloy is used as a non-consumable electrode, and an arc is generated between the non-consumable electrode and a workpiece to perform processing such as welding or cutting. ing. Although this electrode is non-consumable, in reality, the tip of the non-consumable electrode is gradually deformed and consumed as the processing operation progresses. By the way, if the tip of the electrode is deformed or consumed, the state of generation of the electric arc will not be the desired state. For this reason, it is necessary to perform a repair operation for bringing the electrode tip into a desired sharp state.

When an object to be welded, for example, is present at the tip side of the arc torch, the non-consumable electrode cannot be handled. The work of attaching and detaching the non-conductive electrode is performed. However, it is troublesome to move the entire arc torch each time the arcing torch is attached and detached, and the operation time is long, which is not preferable in production. In order to cope with this, an arc torch capable of handling a non-consumable electrode in a direction opposite to a distal end side while a main body position of the arc torch is fixed is used.

Conventionally, an arc torch shown in FIG. 3 has been proposed. That is, in FIG. 3, reference numeral 51 denotes a torch body having a through hole in a shaft core, and 52 denotes a torch body 51.
A collet body having a through hole in a shaft core attached to the tip of the collet body 52. The collet body 52 is provided with a hole 521 that opens in the X2 direction, and the end of the hole 521 in the X1 direction has an X1 direction. An inclined recess 522 having a diameter decreasing toward is provided. 53 is a gas nozzle attached to the tip of the torch body 51, and 54 is a torch body 5
The collet receiver 54 is detachably attached to one of the shaft cores. The collet receiver 54 has a head 542 provided with a male screw 541 screwed into a female screw of the torch body 51, and extends from the head 542 in the X1 direction. And a tubular portion 543. Further, the collet receiver 54 is provided with a hole 544 that opens in the X2 direction, and an inclined recessed portion 54 whose diameter decreases in the X1 direction is provided at the end of the hole 544 in the X1 direction.
5 are provided. 55 is a hole 54 of the collet receiver 54
The first collet 55 is provided with a through hole 551 in the shaft core portion.
At the end in the X1 direction, a frusto-conical convex portion 552 is provided to engage with the inclined concave portion 545, and the frusto-conical convex portion 552 is provided.
A slit 553 extending in the X2 direction. Reference numeral 56 denotes a collet press provided with a male screw 561 to be screwed into the female screw of the collet receiver 54, and 57 denotes a second collet inserted into the hole 521 of the collet body 52. Similarly to the collet 55, there are provided a hole 571 opening in the X2 direction, a truncated conical projection 572 engaging with the inclined recess 522, and a slit 573 directed in the X2 direction. The collet body 52, the collet receiver 54, the first collet 55, and the second collet 56 are provided with holes through which the non-consumable electrode 9 is inserted.

In the above-mentioned conventional torch, for example, as shown in FIG. 4, a first collet 55 is arranged in a cylindrical portion 543 of a collet receiver 54, and a tip of a non-consumable electrode 9 inserted through the shaft core portion. The collet receiver 54 is arranged such that the distance between the end of the cylindrical portion 543 in the X1 direction becomes a desired value L1.
The collet presser 56 is operated in the X1 direction.
That is, by moving the collet presser 56 in the X1 direction,
The truncated conical convex portion 552 of the first collet 55 engages with the inclined concave portion 545 of the collet receiver 54, and the leading end of the slit 553 of the first collet 55 is reduced in diameter by the contact of the concave and convex portions. Then, the non-consumable electrode 9 is fixed. After this,
As shown in FIG. 3, the second collet 57 is inserted into the hole 521 of the collet body 52, and then the non-consumable electrode 9 and the collet receiver 54, which are integrally attached, are moved in the X1 direction from the X2 direction side of the torch body 51. It is inserted toward. The end of the collet receiver 54 in the X1 direction contacts the second collet 57, and the collet receiver 54 screwed with the torch body 51 is operated in the X1 direction.
The concave and convex portions of the second collet 57 and the collet body 52 engage in the X direction, and the slit 57 of the second collet 57
The diameter of the leading end of the torch 3 is fixed, and the non-consumable electrode 9 is fixed. As a result, each part of the torch is integrally formed.

As described above, when the distance between the tip of the non-consumable electrode 9 and the end of the cylindrical portion 543 in the X1 direction is set to L1, the non-consumable electrode 9 is connected to the gas nozzle 53 due to the mechanism of the torch.
From the projection by a length L2. The slit 5 of the second collet 57 for locking the non-consumable electrode 9 in this state
For example, an arc welding operation is performed while the power is supplied from the distal end portion 73. Of course, if the tip of the non-consumable electrode 9 is deformed or consumed as the welding operation proceeds, the collet receiver 5
The collet receiver 54 and the non-consumable electrode 9 are integrally taken out from the torch body 51 in the X2 direction by operating the 4 in the X2 direction.

[0007]

If the object to be welded is flat, the welding operation can be performed with the non-consumable electrode 9 having the protruding length L2. 5
As shown in (B), when welding the fillet portion or the inside of the groove, the protruding length of the non-consumable electrode 9 needs to be longer than L2, for example, L3. In this case, in the above-mentioned conventional torch, the collet receiver 54 and the collet presser 56 are sequentially and separately screwed in the X2 direction so that the first and second collets 55 and 57 lock the non-consumable electrode 9. The state is released, and the collet receiver 54 and the collet presser 56 are sequentially and separately moved in the X1 direction while the worker supports the non-consumable electrode 9 so that the tip of the non-consumable electrode 9 is at a desired position. By screwing, the non-consumable electrode 9 can be maintained in the locked state again by the first and second collets 55 and 57. However, when welding the intricate fillet or the inside of the groove, the operator cannot insert the hand of the operator into the torch tip to support the tip of the non-consumable electrode 9 even if the tip of the torch can be seen. There are many cases.

Therefore, the gas nozzle 3 of the non-consumable electrode 9
When the length of protrusion from the torch is changed from L2 to L3, the collet receiver 54 is operated to move in the X2 direction, and the collet receiver 54 and the non-consumable electrode 9 are integrally moved from the torch body 51 to the X2 direction. The non-consumable electrode 9 is taken out of the torch body 51 so that the protruding length of the non-consumable electrode 9 is equivalent to L2, that is, the set protruding length of the non-consumable electrode 9 from the cylindrical portion 543 is set to L1 + (L3-L2). ), And after that, the collet receiver 54 and the non-consumable electrode 9 were mounted on the torch body 51 again, so that the working efficiency was poor.

Further, by disposing a second collet 57 between the first collet 55 and the workpiece W to supply power to the non-consumable electrode 9, resistance heating of the non-consumable electrode 9 by welding current is performed. Is kept small so that the non-consumable electrode 9 is not easily consumed. Thus, the non-consumable electrode 9
Is supplied via the second collet 57, but the locking portion of the first collet 55 for taking out the non-consumable electrode 9 to the outside of the torch body 51 is more than X above the power supply position.
Since the position is in two directions, if the length of the non-consumable electrode 9 is shorter than the locking position of the first collet 55, the electrode cannot be used and must be replaced with a new non-consumable electrode 9. That is, even if the length of the non-consumable electrode 9 is longer than the above-mentioned power supply position, if the length is shorter than the position where the first collet 55 is locked, it is uneconomical because it is replaced with a new one.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to fix a torch body in a fixed position and attach / detach a non-consumable electrode from a direction opposite to a tip end of the torch. An object of the present invention is to provide an economical arc torch in which the length of protrusion of a non-consumable electrode can be freely set while the non-consumable electrode is mounted.

[0011]

According to the first aspect of the present invention, a frusto-conical convex portion is provided at one end, and a slit extending from the frusto-conical convex portion toward the other end portion extends in the axial direction. A non-consumable electrode is inserted into a hole in the axial center of the collet, and the diameter of the hole in the axial center on the side of the truncated conical convex portion of the collet is reduced to form an arc torch for mounting the non-consumable electrode. Applied.
The feature is that a collet body in which a hole is provided in the shaft center portion and an inclined concave portion corresponding to the convex portion of the collet is formed, and a collet body is attached to one end portion and a hole is provided in the shaft center portion. A collet body mounting member, a collet presser screwed to the collet body mounting member, and a collet presser for pressing / releasing the collet body from a collet inserted into a hole in the shaft center portion of the collet body mounting member; A torch body provided with a hole in the torch body, and a fixture for fixing a collet body mounting member which is inserted into the hole in the axial center of the torch body and is formed so as to be capable of screwing in the axial direction of the torch body at a desired position. It is to have.

[0012] The second invention is the first invention, wherein
The collet is directly pressed by a collet presser.

According to a third aspect of the present invention, in the first aspect,
It is characterized in that the collet is pressed via a cylindrical sleeve.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. 1 and 2, reference numeral 1 denotes a torch body having a through hole in a shaft core, and a small-diameter hole 101 in the X1 direction and a large-diameter hole 102 in two directions communicating with the small-diameter hole 101.
Are formed, and a female screw 103 is formed on the end side in the X2 direction. Reference numeral 2 denotes a gas nozzle attached to the tip of the torch body 1, and reference numeral 3 denotes a collet body attaching member that is inserted through a shaft portion of the torch body 1. Head 302 provided with 301
And a cylindrical portion 303 extending from the head portion 302 in the X1 direction.
It is made up of A through hole 304 is formed in the shaft core of the collet body mounting member 3, and female screws 305 and 306 are formed at the ends in the X1 and X2 directions.

Reference numeral 4 denotes a collet body attached to the end of the collet body attaching member 3 in the X1 direction.
And is integrally attached by screwing to the female screw 305. The collet body 4 is provided with a hole 402 that opens in the X2 direction. At the end of the hole 402 in the X1 direction, there is provided an inclined recess 403 whose diameter decreases in the X1 direction.
In addition, a through hole 404 slightly larger than the diameter of the non-consumable electrode 9 to be used is formed in the shaft core. Reference numeral 5 denotes a collet which is inserted into a through hole 304 of the shaft core of the collet body mounting member 3.
1 is provided, and at the end in the X1 direction, a truncated cone-shaped convex portion 502 that fits into the inclined concave portion 403 is provided.
Further, a slit 503 extending from the truncated conical projection 502 in the X2 direction is provided.

Reference numeral 6 denotes a cylindrical sleeve, which is inserted into the through hole 304 of the collet body mounting member 3 such that the cylindrical sleeve 6 is on the X2 direction side of the collet 5. Reference numeral 7 denotes a collet press provided with a male screw 701 to be screwed into the female screw 306 of the collet body mounting member 3, and reference numeral 8 denotes a fixing tool. The fixing tool 8 has a male screw provided at a position of the collet body mounting member 3 in the X2 direction. Female screw 801 screwed into 307
Is provided. Although the cylindrical sleeve 6 and the collet presser 7 are integrally formed by brazing, welding, or the like, they can be formed separately.

In the above-mentioned torch, for example, as shown in FIG.
A collet 5 and a cylindrical sleeve 6 are arranged in the tube 4, and the collet presser 7 is operated so as to advance in the X1 direction with the non-consumable electrode 9 inserted through the shaft core. That is, the collet presser 7 is moved in the X1 direction, and the truncated cone-shaped convex portion 502 of the collet 5 engages with the inclined concave portion 403 of the collet body 4 through the cylindrical sleeve 6 to engage the concave portion. Due to the contact, the tip of the slit 503 of the collet 5 is reduced in diameter, and the non-consumable electrode 9 is fixed. For example,
The non-consumable electrode 9 and the collet body mounting member 3 are fixed so that the distance between the tip of the non-consumable electrode 9 and the end of the collet body 4 in the X1 direction becomes a desired value L4.

Thereafter, the non-consumable electrode 9 and the collet body mounting member 3 which are integrally mounted are attached to the torch body 1.
Is inserted from the X2 direction side to the X1 direction, and the collet body mounting member 3 screwed with the torch body 1 is screwed in the X1 direction, and the collet body mounting member 3 is positioned at a predetermined position in the X direction with respect to the torch body 1. In this state, the collet body mounting member 3 is fixed by the fixing tool 8.

As described above, the tip of the non-consumable electrode 9 and the end of the collet body 4 in the X1 direction are set at the distance L4, and the collet body mounting member 3 is positioned at a predetermined position in the X direction with respect to the torch body 1. Is fixed to the non-consumable electrode 9 due to the mechanism of the torch.
Only in a protruding state. In this state, for example, an arc welding operation is performed while power is supplied from the tip of the collet 5 for locking the non-consumable electrode 9. At the time of welding, a shielding gas is supplied from a supply port 104 provided in the torch body 1, but is appropriately shielded in the X2 direction by an airtight member, for example, O-rings 11,11.

Of course, if the tip of the non-consumable electrode 9 is deformed or consumed as the welding operation proceeds, the collet body mounting member 3 is operated to move in the X2 direction, and the collet body mounting member 3 and The non-consumable electrode 9 is integrally taken out from the torch body 1 in the X2 direction.

Further, when welding the fillet portion or the inside of the groove, the protruding length of the non-consumable electrode 9 from the gas nozzle 2 is set to L.
In this case, it is necessary to make the protrusion length L3 longer than 2, but in this case, after the fixing tool 8 is loosened, the collet body mounting member 3 is screwed in the X1 direction relative to the torch body 1 by a distance (L3-L2). Thereafter, the collet body mounting member 3 is again fixed to the torch body 1 by the fixture 8, so that the desired projection length L3 of the non-consumable electrode 9 can be realized.

Further, while the non-consumable electrode 9 is locked by the reduced diameter portion at the tip of the slit 503 of the collet 5, power is supplied to the non-consumable electrode 9 from this locking portion. This power supply position is the same as the conventional one, and the non-consumable electrode 9 is not easily consumed by keeping the resistance heating of the non-consumable electrode 9 due to the welding current small. Of course, the locking portion of the non-consumable electrode 9 by the collet 5 is a portion corresponding to the power supply position, and is located on the tip side of the non-consumable electrode 9 as compared with, for example, the torch shown in FIGS. In addition, the usable length of the non-consumable electrode 9, which is gradually consumed, can be shortened as much as possible, which is economical. In short, according to the present invention, in a state where the position of the torch body is fixed, the non-consumable electrode can be attached / detached from the direction opposite to the tip side of the torch, and the non-consumable electrode is attached to the torch body while the non-consumable electrode is attached. It is possible to realize an economical arc torch that can freely set the protruding length of the electric arc.

If the collet body 4 is formed separately, it is easy to manufacture the opening hole 402 and the inclined recessed portion 403. Nevertheless, the collet body and the collet body mounting member must be integrated. Can be.

[0024]

As is apparent from the above description, the arc torch according to the present invention has a frusto-conical projection at one end and a slit facing the frusto-conical projection toward the other end. The non-consumable electrode is inserted into a hole in the axial portion of the collet extending in the axial direction, and the diameter of the hole in the axial portion on the side of the truncated conical convex portion of the collet is reduced. An arc torch for mounting an electrode, wherein a collet body is provided with a hole at an axial center portion and an inclined concave portion corresponding to a convex portion of the collet is formed, and a collet body is attached at one end portion to the axial center portion. A collet body mounting member provided with a hole, and a collet presser which is screwed to the collet body mounting member and presses / releases the collet inserted into the hole in the shaft center portion of the collet body mounting member against the collet body. Toe with a hole in the shaft center A torch body, and a fixture for fixing a collet body mounting member, which is inserted into a hole in the axial center portion of the torch body and is capable of screwing in the axial direction of the torch body, at a desired position. With the position of the torch fixed, the non-consumable electrode can be attached and detached from the direction opposite to the tip of the torch, and the protruding length of the non-consumable electrode can be set freely with the non-consumable electrode attached to the torch body. An economical arc torch can be realized.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is an explanatory view of an assembled state of FIG. 1;

FIG. 3 is a longitudinal sectional view showing a conventional example.

FIG. 4 is an explanatory view of an assembled state of FIG. 3;

FIG. 5 is an explanatory view of a processing state to which the present invention is applied;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Torch body 2 Gas nozzle 3 Collet body mounting member 4 Collet body 5 Collet 7 Collet presser 8 Fixture 9 Non-consumable electrode 403 Inclined concave part formed in collet body 4 502 Truncated conical convex part formed in collet 5 503 Collet The slit formed in 5

Claims (3)

[Claims] 1. A frustum-shaped conical projection is provided at one end, and a slit facing the other end of the frusto-conical projection is not consumed in a hole in an axial center portion of a collet extending in an axial direction. An arc electrode to insert the non-consumable electrode by inserting a non-consumable electrode into the collet and reducing the hole diameter of the shaft portion on the side of the truncated conical convex portion of the collet, wherein the hole is provided in the shaft portion. A collet body in which an inclined concave portion corresponding to the convex portion of the collet is formed, a collet body attaching member in which a collet body is attached to one end portion and a hole is provided in an axial center portion, and a collet body attaching member , A collet presser that presses and releases the collet inserted into the hole at the shaft center of the collet body mounting member with respect to the collet body, a torch body having a hole at the shaft center, and a shaft center of the torch body. Torch inserted into the hole Arc torch electrostatic formed by and a fixture for fixing the collet body mounting member which is screwed freely formed in the axial direction of I in a desired position. 2. The arc torch according to claim 1, wherein the collet is directly pressed by a collet retainer. 3. The electric arc torch according to claim 1, wherein the collet is pressed through a cylindrical sleeve.